Doesn't this talent-less idiot realise that the "years of grime" he cleaned off is known as patina! Anyone who knows anything about antiques knows you NEVER polish off the patina. Why doesn't he try producing some real art, rather than vandalising historic city monuments.
On the other hand, maybe he's one of these so called alternative 'artists' who will now believe he's created a piece of art just because he's provoked discussion about his 'work'.
His form of vandalism is far worse than a yob who throws a brick though a window. Glass can be replaced, but this idiot's damage will take many years!

He did a pretty poor job of cleaning it.. Probably a student.
Still, looks a little nicer now you can see the text properly.
Made me think though, if using objects as a place to eat food is a form of art then next time I'm having a ginsters in the car I'll have to remember to be a little smug on account of subverting a method of transport via the medium of cold ready meals.
Makes you think...